A yeast cell “racing” towards a stop. (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption A yeast cell “racing” towards a stop. Credit Nguyen Tâm Johan (EPFL) Usage Restrictions Media purposes only. Commercial usage restricted; by permission only. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.